Question # 1

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

For inducing emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both (b) and (c) are true

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

The motional emf is give by

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qvB

IBL

eBL

vBL

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be:

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Antoclockwise

Clockwise

First Clockwise and then Antoclockwise

First anticlockwise and then Clockwise

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

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